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https://issues.apache.org/jira/browse/HIVE-26047?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18005140#comment-18005140
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Butao Zhang commented on HIVE-26047:
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I just sent a dev email to disscuss these tickets.
https://lists.apache.org/thread/x93dfr32b7sf0n01hrgy87xsvl27yx3m
> Vectorized LIKE UDF should use Re2J regex to address JDK-8203458
> ----------------------------------------------------------------
>
> Key: HIVE-26047
> URL: https://issues.apache.org/jira/browse/HIVE-26047
> Project: Hive
> Issue Type: Bug
> Reporter: Naresh P R
> Assignee: Naresh P R
> Priority: Major
> Labels: pull-request-available
> Time Spent: 50m
> Remaining Estimate: 0h
>
> Below pattern is taking a long time to validate regex in java8 with same
> trace as shown in java bug
> [JDK-8203458|https://bugs.java.com/bugdatabase/view_bug.do?bug_id=JDK-8203458]
>
> {code:java}
> import java.util.regex.Pattern;
> public class Test {
> public static void main(String args[]) {
> String pattern =
> "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa_b";
>
> Pattern CHAIN_PATTERN = Pattern.compile("(%?[^%_\\\\]+%?)+");
> CHAIN_PATTERN.matcher(pattern).matches();
> }
> }
> {code}
> Same is reproducible with following SQL
> {code:java}
> create table table1(name string);
> insert into table1 (name) values
> ('aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa_b');
> select * from table1 where name like
> "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa_b";{code}
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